[mig_]

Two theories.

1. Google already does a good job of filtering out email addresses. I remember searching email addresses I was curious about 5ish years ago and getting results. Today, I get far fewer hits. So my theory is that google is already attempting to sort of scrub peoples email addresses from their searches. Us filling out the form is feedback to the machine learning.

2. Google wants to corner the market on this information and this is how they bleed the companies out. (I don't they have _actually_ devoted enough resources to this to bleed the other companies out) The business motive? There isn't a particular offering this data is good for besides selling to 3rd parties besides the business Google is already in. This data could enhance other data sets for other offerings. As simple as "auto-complete" for phone number after you have entered your name or address fill after entering your phone number.